public class Test{
     //main????
     public static void main(String[] args){
        //???hello
        System.out.println("hello");
        //???????int????????
        int a;
        //?????a
         a = 10;
          //???a???
          System.out.println("a="+a);
           // a=10.1??C??
            int b;
            b = 15;
             System.out.println("b="+b);
              int c = b;
         System.out.println("c="+c);
          //???????
           char c1 = 'a';
            char c2 = 'B';
            char c3 = '??';
             char c4 = '??';
              //char c5='';
               //char c6='abc';
               System.out.println("c1:" + c1);
                System.out.println("c2:" + c2);
                System.out.println("c3:" + c3);
                 System.out.println("c4:" + c4);
                  //System.out.println("c5:"+c5)??//???????;
                   //System.out.println("c6:"+c6)??//???????;
                    //int ???????????????char????
                    char c7 = 48;
                    System.out.println("c7:" + c7);//0
                     char c8 = 65;
                      System.out.println("c8:" + c8);//A
                       //??????
                       String s1 = "Hello,\" World\"!";
                        System.out.println("s1:" + s1);
                        System.out.println("??" + "C:\\Program Files\\Java\\jdk1.8.0_74\\bin");
  }
}